Thanks Patrick for the screen shot. Would you mind sharing your machine specs as well?
So would I be accurate in saying that what you see is a lot darker than what the screenshot shows?
MacBook Pro Early-2011
OS: 10.8.5
Graphics: Intel HD 3000 @ 512 MB + AMD Radeon HD 6750M @ 1024 MB
As to whether it appears darker than what the screenshothows... I would have to say yes. Basically if I look at the screenshot on my iPad or a Windows machine it is brighter.
Edit:
I too had to play around with my gamma settings to see in the dark and not be frustrated.
Edit 2:
There is an effect I haven't seen since the Mac OS 9 days, when Windows and Mac had different gamma profiles. If I launch the game and then switch to Finder everything is cast in a light bluish tint.